Average Session Duration
01 Definition
Average Session Duration meaning: Average session duration is the mean length of visits over a chosen period.
Average session duration divides total time across all sessions by the number of sessions. Time is usually measured between recorded hits or events, so the final page or event of a session often adds no time. This can make durations look shorter than the real time spent.
Why it matters
How Average Session Duration fits the work
Average session duration gives a rough sense of how long people stay, useful for spotting big shifts in engagement after content or design changes.
In context
If total session time is 620,000 seconds across 12,400 sessions, the average session duration is about 50 seconds per visit.
Practical note
Because time on the last page is often not measured, this metric understates real engagement and should be compared over time rather than read as an exact figure.